#seesmicsidebar-button {
  list-style-image: url("chrome://seesmicsidebar/skin/seesmicsidebar.png");
  -moz-image-region: rect(0px 24px 24px 0px);
}

#seesmicsidebar-button:hover {
  -moz-image-region: rect(0px 24px 24px 0px);
}

#seesmicsidebar-button[disabled="true"] {
  -moz-image-region: rect(0px 24px 24px 0px);
}
